LOANS AND ALLOWANCE FOR CREDIT LOSSES - TDR MODIFICATIONS (Details)	12 Months Ended
	Dec. 31, 2020 USD ($) loan	Dec. 31, 2019 USD ($) loan	Dec. 31, 2018 USD ($) loan
Troubled Debt Restructurings disclosures
Period of time loans are not past due in which TDR loans are performing	30 days
Number of Loans | loan	2,388	1,828
Recorded Investment	$ 20,778,000	$ 30,781,000
Commitments to lend any additional material amounts to existing TDR relationships	0	0
Change between the pre and post modification loan	$ 0	$ 0	$ 0
Modified During The Period
Troubled Debt Restructurings disclosures
Number of Loans | loan	510	1,320	25
Recorded Investment	$ 1,106,000	$ 8,599,000	$ 4,948,000
Performing Financing Receivable
Troubled Debt Restructurings disclosures
Number of Loans | loan	2,371	1,811
Recorded Investment	$ 17,317,000	$ 28,138,000
Percentage of troubled debt restructurings performing as per terms of modifications	83.00%	91.00%
Specific reserve allocations made to customers	$ 1,000,000	$ 2,000,000
Percentage of Bank's TDRs that occurred during period, which were performing according to their modified terms	88.00%	83.00%	42.00%
Specific reserve allocations made to customers whose loan terms were modified in TDRs during period	$ 48,000	$ 220,000	$ 472,000
Performing Financing Receivable | Modified During The Period
Troubled Debt Restructurings disclosures
Number of Loans | loan	506	1,313	19
Recorded Investment	$ 972,000	$ 7,155,000	$ 2,083,000
Nonperforming Financing Receivable
Troubled Debt Restructurings disclosures
Number of Loans | loan	17	17
Recorded Investment	$ 3,461,000	$ 2,643,000
Nonperforming Financing Receivable | Modified During The Period
Troubled Debt Restructurings disclosures
Number of Loans	4	7	6
Recorded Investment	$ 134,000	$ 1,444,000	$ 2,865,000
Residential Real Estate
Troubled Debt Restructurings disclosures
Number of Loans | loan	184	194
Recorded Investment	$ 15,230,000	$ 19,770,000
Residential Real Estate | Interest only payments
Troubled Debt Restructurings disclosures
Number of Loans | loan	1	1
Recorded Investment	$ 826,000	$ 904,000
Residential Real Estate | Rate reduction
Troubled Debt Restructurings disclosures
Number of Loans | loan	107	123
Recorded Investment	$ 9,896,000	$ 14,199,000
Residential Real Estate | Principal deferral
Troubled Debt Restructurings disclosures
Number of Loans | loan	11	10
Recorded Investment	$ 1,024,000	$ 1,024,000
Residential Real Estate | Legal modifications
Troubled Debt Restructurings disclosures
Number of Loans | loan	65	60
Recorded Investment	$ 3,484,000	$ 3,643,000
Residential Real Estate | Modified During The Period
Troubled Debt Restructurings disclosures
Number of Loans | loan	21	32	17
Recorded Investment	$ 888,000	$ 2,740,000	$ 3,466,000
Residential Real Estate | Modified During The Period | Interest only payments
Troubled Debt Restructurings disclosures
Number of Loans | loan			1
Recorded Investment			$ 970,000
Residential Real Estate | Modified During The Period | Rate reduction
Troubled Debt Restructurings disclosures
Number of Loans | loan		1	2
Recorded Investment		$ 365,000	$ 465,000
Residential Real Estate | Modified During The Period | Principal deferral
Troubled Debt Restructurings disclosures
Number of Loans | loan	3		6
Recorded Investment	$ 56,000		$ 1,892,000
Residential Real Estate | Modified During The Period | Legal modifications
Troubled Debt Restructurings disclosures
Number of Loans | loan	18	31	8
Recorded Investment	$ 832,000	$ 2,375,000	$ 139,000
Residential Real Estate | Performing Financing Receivable
Troubled Debt Restructurings disclosures
Number of Loans | loan	169	181
Recorded Investment	$ 14,278,000	$ 18,796,000
Residential Real Estate | Performing Financing Receivable | Interest only payments
Troubled Debt Restructurings disclosures
Number of Loans | loan	1	1
Recorded Investment	$ 826,000	$ 904,000
Residential Real Estate | Performing Financing Receivable | Rate reduction
Troubled Debt Restructurings disclosures
Number of Loans | loan	101	118
Recorded Investment	$ 9,526,000	$ 13,847,000
Residential Real Estate | Performing Financing Receivable | Principal deferral
Troubled Debt Restructurings disclosures
Number of Loans | loan	9	8
Recorded Investment	$ 858,000	$ 845,000
Residential Real Estate | Performing Financing Receivable | Legal modifications
Troubled Debt Restructurings disclosures
Number of Loans | loan	58	54
Recorded Investment	$ 3,068,000	$ 3,200,000
Residential Real Estate | Performing Financing Receivable | Modified During The Period
Troubled Debt Restructurings disclosures
Number of Loans | loan	17	27	12
Recorded Investment	$ 754,000	$ 2,323,000	$ 629,000
Residential Real Estate | Performing Financing Receivable | Modified During The Period | Rate reduction
Troubled Debt Restructurings disclosures
Number of Loans | loan		1	2
Recorded Investment		$ 365,000	$ 465,000
Residential Real Estate | Performing Financing Receivable | Modified During The Period | Principal deferral
Troubled Debt Restructurings disclosures
Number of Loans | loan	2		3
Recorded Investment	$ 53,000		$ 43,000
Residential Real Estate | Performing Financing Receivable | Modified During The Period | Legal modifications
Troubled Debt Restructurings disclosures
Number of Loans | loan	15	26	7
Recorded Investment	$ 701,000	$ 1,958,000	$ 121,000
Residential Real Estate | Nonperforming Financing Receivable
Troubled Debt Restructurings disclosures
Number of Loans | loan	15	13
Recorded Investment	$ 952,000	$ 974,000
Residential Real Estate | Nonperforming Financing Receivable | Rate reduction
Troubled Debt Restructurings disclosures
Number of Loans | loan	6	5
Recorded Investment	$ 370,000	$ 352,000
Residential Real Estate | Nonperforming Financing Receivable | Principal deferral
Troubled Debt Restructurings disclosures
Number of Loans | loan	2	2
Recorded Investment	$ 166,000	$ 179,000
Residential Real Estate | Nonperforming Financing Receivable | Legal modifications
Troubled Debt Restructurings disclosures
Number of Loans | loan	7	6
Recorded Investment	$ 416,000	$ 443,000
Residential Real Estate | Nonperforming Financing Receivable | Modified During The Period
Troubled Debt Restructurings disclosures
Number of Loans	4	5	5
Recorded Investment	$ 134,000	$ 417,000	$ 2,837,000
Residential Real Estate | Nonperforming Financing Receivable | Modified During The Period | Interest only payments
Troubled Debt Restructurings disclosures
Number of Loans | loan			1
Recorded Investment			$ 970,000
Residential Real Estate | Nonperforming Financing Receivable | Modified During The Period | Principal deferral
Troubled Debt Restructurings disclosures
Number of Loans	1		3
Recorded Investment	$ 3,000		$ 1,849,000
Residential Real Estate | Nonperforming Financing Receivable | Modified During The Period | Legal modifications
Troubled Debt Restructurings disclosures
Number of Loans	3	5	1
Recorded Investment	$ 131,000	$ 417,000	$ 18,000
Commercial Real Estate
Troubled Debt Restructurings disclosures
Number of Loans | loan	7	13
Recorded Investment	$ 4,904,000	$ 8,925,000
Commercial related and construction/land development
Troubled Debt Restructurings disclosures
Number of Loans | loan	9	21
Recorded Investment	$ 4,949,000	$ 10,425,000
Commercial related and construction/land development | Interest only payments
Troubled Debt Restructurings disclosures
Number of Loans | loan	1	3
Recorded Investment	$ 488,000	$ 1,568,000
Commercial related and construction/land development | Rate reduction
Troubled Debt Restructurings disclosures
Number of Loans | loan	3	4
Recorded Investment	$ 1,091,000	$ 1,252,000
Commercial related and construction/land development | Principal deferral
Troubled Debt Restructurings disclosures
Number of Loans | loan	5	12
Recorded Investment	$ 3,370,000	$ 6,578,000
Commercial related and construction/land development | Legal modifications
Troubled Debt Restructurings disclosures
Number of Loans | loan		2
Recorded Investment		$ 1,027,000
Commercial related and construction/land development | Modified During The Period
Troubled Debt Restructurings disclosures
Number of Loans | loan	2	8	7
Recorded Investment	$ 133,000	$ 5,649,000	$ 1,430,000
Commercial related and construction/land development | Modified During The Period | Interest only payments
Troubled Debt Restructurings disclosures
Number of Loans | loan		2
Recorded Investment		$ 1,423,000
Commercial related and construction/land development | Modified During The Period | Principal deferral
Troubled Debt Restructurings disclosures
Number of Loans | loan	2	4	6
Recorded Investment	$ 133,000	$ 3,199,000	$ 1,402,000
Commercial related and construction/land development | Modified During The Period | Legal modifications
Troubled Debt Restructurings disclosures
Number of Loans | loan		2	1
Recorded Investment		$ 1,027,000	$ 28,000
Commercial related and construction/land development | Performing Financing Receivable
Troubled Debt Restructurings disclosures
Number of Loans | loan	7	17
Recorded Investment	$ 2,440,000	$ 8,756,000
Commercial related and construction/land development | Performing Financing Receivable | Interest only payments
Troubled Debt Restructurings disclosures
Number of Loans | loan	1	3
Recorded Investment	$ 488,000	$ 1,568,000
Commercial related and construction/land development | Performing Financing Receivable | Rate reduction
Troubled Debt Restructurings disclosures
Number of Loans | loan	2	3
Recorded Investment	$ 1,046,000	$ 1,207,000
Commercial related and construction/land development | Performing Financing Receivable | Principal deferral
Troubled Debt Restructurings disclosures
Number of Loans | loan	4	11
Recorded Investment	$ 906,000	$ 5,981,000
Commercial related and construction/land development | Performing Financing Receivable | Modified During The Period
Troubled Debt Restructurings disclosures
Number of Loans | loan	2	6	6
Recorded Investment	$ 133,000	$ 4,622,000	$ 1,402,000
Commercial related and construction/land development | Performing Financing Receivable | Modified During The Period | Interest only payments
Troubled Debt Restructurings disclosures
Number of Loans | loan		2
Recorded Investment		$ 1,423,000
Commercial related and construction/land development | Performing Financing Receivable | Modified During The Period | Principal deferral
Troubled Debt Restructurings disclosures
Number of Loans | loan	2	4	6
Recorded Investment	$ 133,000	$ 3,199,000	$ 1,402,000
Commercial related and construction/land development | Nonperforming Financing Receivable
Troubled Debt Restructurings disclosures
Number of Loans | loan	2	4
Recorded Investment	$ 2,509,000	$ 1,669,000
Commercial related and construction/land development | Nonperforming Financing Receivable | Rate reduction
Troubled Debt Restructurings disclosures
Number of Loans | loan	1	1
Recorded Investment	$ 45,000	$ 45,000
Commercial related and construction/land development | Nonperforming Financing Receivable | Principal deferral
Troubled Debt Restructurings disclosures
Number of Loans | loan	1	1
Recorded Investment	$ 2,464,000	$ 597,000
Commercial related and construction/land development | Nonperforming Financing Receivable | Legal modifications
Troubled Debt Restructurings disclosures
Number of Loans | loan		2
Recorded Investment		$ 1,027,000
Commercial related and construction/land development | Nonperforming Financing Receivable | Modified During The Period
Troubled Debt Restructurings disclosures
Number of Loans | loan		2	1
Recorded Investment		$ 1,027,000	$ 28,000
Commercial related and construction/land development | Nonperforming Financing Receivable | Modified During The Period | Legal modifications
Troubled Debt Restructurings disclosures
Number of Loans | loan		2	1
Recorded Investment		$ 1,027,000	$ 28,000
Consumer
Troubled Debt Restructurings disclosures
Number of Loans | loan	2,195	1,613
Recorded Investment	$ 599,000	$ 586,000
Consumer | Rate reduction
Troubled Debt Restructurings disclosures
Number of Loans | loan		1,612
Recorded Investment		$ 577,000
Consumer | Principal deferral
Troubled Debt Restructurings disclosures
Number of Loans | loan	2,193	1
Recorded Investment	$ 578,000	$ 9,000
Consumer | Legal modifications
Troubled Debt Restructurings disclosures
Number of Loans | loan	2
Recorded Investment	$ 21,000
Consumer | Modified During The Period
Troubled Debt Restructurings disclosures
Number of Loans | loan	487	1,280	1
Recorded Investment	$ 85,000	$ 210,000	$ 52,000
Consumer | Modified During The Period | Principal deferral
Troubled Debt Restructurings disclosures
Number of Loans | loan	486	1,279	1
Recorded Investment	$ 71,000	$ 201,000	$ 52,000
Consumer | Modified During The Period | Legal modifications
Troubled Debt Restructurings disclosures
Number of Loans | loan	1	1
Recorded Investment	$ 14,000	$ 9,000
Consumer | Performing Financing Receivable
Troubled Debt Restructurings disclosures
Number of Loans | loan	2,195	1,613
Recorded Investment	$ 599,000	$ 586,000
Consumer | Performing Financing Receivable | Rate reduction
Troubled Debt Restructurings disclosures
Number of Loans | loan		1,612
Recorded Investment		$ 577,000
Consumer | Performing Financing Receivable | Principal deferral
Troubled Debt Restructurings disclosures
Number of Loans | loan	2,193	1
Recorded Investment	$ 578,000	$ 9,000
Consumer | Performing Financing Receivable | Legal modifications
Troubled Debt Restructurings disclosures
Number of Loans | loan	2
Recorded Investment	$ 21,000
Consumer | Performing Financing Receivable | Modified During The Period
Troubled Debt Restructurings disclosures
Number of Loans | loan	487	1,280	1
Recorded Investment	$ 85,000	$ 210,000	$ 52,000
Consumer | Performing Financing Receivable | Modified During The Period | Principal deferral
Troubled Debt Restructurings disclosures
Number of Loans | loan	486	1,279	1
Recorded Investment	$ 71,000	$ 201,000	$ 52,000
Consumer | Performing Financing Receivable | Modified During The Period | Legal modifications
Troubled Debt Restructurings disclosures
Number of Loans | loan	1	1
Recorded Investment	$ 14,000	$ 9,000